The Fosi Audio BT20A Pro 48V is a mini TPA3255 Class D Bluetooth power amplifier rated 300W x2, with bass and treble controls. This 48V power supply version is the one for less sensitive bookshelf speakers or a larger room, where you want the amp's full output.
Who the Fosi Audio BT20A Pro 48V is for
Less sensitive speakers or larger rooms: The 48V power supply version is the one to pick when you want the amp's full output on tap for harder-to-drive bookshelf speakers or a bigger space.
Desktop speaker placements: Bass and treble controls give the small correction many desk placements need, which a purist amp won't offer.
Wireless listening: A Bluetooth input lets a wireless source play through your speakers without a cable run.
Fosi Audio BT20A Pro 48V key specs
Output power: 300W x2
Power supply: 48V version
Amplifier chip: TPA3255
Amplifier class: Class D stereo
Wireless input: Bluetooth
Tone controls: Bass and treble
Colors: Black, Blue
Free shipping on every order, 45-day returns.
Fosi Audio BT20A Pro 48V vs similar options
vs Fosi Audio BT20A Pro: The same TPA3255 Class D amp with Bluetooth input and bass and treble controls, paired with a 32V power supply instead; stay with this 48V version for less sensitive bookshelf speakers or a larger room.
vs Fosi Audio V3 Mono: The V3 Mono is a Class-D monoblock, so stereo takes a pair, one amp per channel; the BT20A Pro drives both speakers from one TPA3255 stereo chassis. Pick a V3 pair for true stereo separation.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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